A generous store owner made a high school student's day when she made it her mission to find her a size-22 prom dress after hearing her crying in a changing room.

Kristen Harris, who owns The Designer Diva Consignment Boutique in Abington, Massachusetts, told CBS Boston it 'just killed [her]' to see the young girl so upset and leave her shop without having found a dress that fit her.

So Ms Harris reached out to her with a post on the store's Facebook page. 'I didn't get your name. . . but I will not forget your face,' she promised. 'I'm sorry you were sad, but don't be. I will find you your dream dress!'

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Sympathetic: Kristen Harris, who owns The Designer Diva Consignment Boutique in Abington, Massachusetts, launched a campaign to find a size-22 prom dress for a shopper after hearing her crying in a changing room

Paid off: As a result of her efforts, dozens of plus size dresses were brought into the shop, and Ms Harris ended up tracking down the teenager, who will have her pick from the bunch

Ms Harris followed up the post with one directed at her customers, writing: 'Ladies, please share this status with everyone! I'm begging for plus size prom dresses sizes 20+.

'I just had the most beautiful little girl in here and could not find her size, I want her to look like a princess. . . please please bring in your plus size prom dresses.'

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The shopowner says when the young girl came into her shop and left empty-handed after failing to find a dress, she couldn't help but be heartbroken for her.

'After she left I was just. . . my mother
broke down and I broke down and there were a couple of other parents in
here,' she said. 'And I just thought, I wish I followed her outside.'

Plea: Ms Harris appealed to the shopper as well as her other customers, hoping they would lead her to the girl

Sad thought: She says the main thing that motivated her to find a prom dress for the girl was imagining it were her own daughter. 'I just pictured them being in that dressing room not being able to fit into a dress'

So hoped the Facebook posts would lead her to the girl, and that she'd be able to gift her with the prom dress of her dreams.

Evidently her efforts paid off. 'The responses and people offering dresses has been OVERWHELMING!' she wrote on Facebook just a day later.

'No other girl is going to walk in and not
being able to find something. No one should
feel that way'

Dozens of sympathetic customers brought in their plus-size ballgowns to the shop, including one woman who donated her daughter's old prom dress.